But what says it? The word is near you, even in your mouth, and in your heart: that is, the word of faith, which we preach;
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Ambrosiaster
AD 400
This is said in Deuteronomy [:] in order to show that belief [in Christ] is not all that foreign to our mind or to our nature. Even though we cannot see him with our eyes, what we believe is not out of harmony with the nature of our minds and our way of speaking. Commentary on Paul’s Epistles.
The word is near thee, is near to every one, who to be justified and saved, need but believe, and comply with the doctrine of the gospel which we preach, and make a confession or profession of it with his mouth; and then whether he hath been Jew or Gentile, he shall not be confounded. (Witham)
For the word which we believe is near us, in our mouth, and in our heart; which they, being put in remembrance of, will learn to confess with their mouths that Jesus is the Christ; believing in their heart that God hath raised him from the dead, and being as those who hear, that "with the heart man believeth unto righteousness; and with the mouth confession is made unto salvation."